Paper 
Title 
Page 
WEPAL053 
Dynamic Signal Analysis Based on FPGA for NSRRC DLLRF 
2295 

 F.Y. Chang, L.H. Chang, M.H. Chang, S.W. Chang, L.J. Chen, F.T. Chung, Y.T. Li, M.C. Lin, Z.K. Liu, C.H. Lo, Ch. Wang, M.S. Yeh, T.C. Yu
NSRRC, Hsinchu, Taiwan



As DLLRF control system designs for SRF cavities have greatly matured and the FPGA technology has improved as well, it is possible now to think about incorporating dynamic signal analysis (DSA). Implementation of a DSA in the FPGA is desired to study the frequency response of the open/closed loop gain in a SRF system. Open loop gain is useful to observe the stability of a SRF system while closed loop gain can be applied to investigate the operational bandwidth of the system feedback and also to configure the performance of a PID controller. The DSA function was confirmed by analyzing the frequency response of a digital filter and the results of the analysis will be compared with MATLAB simulations.


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※ https://doi.org/10.18429/JACoWIPAC2018WEPAL053


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WEPAL054 
Digital Low Level Radio Frequency System for the Booster Ring of the Taiwan Photon Source 
2298 

 Z.K. Liu, F.Y. Chang, L.H. Chang, M.H. Chang, S.W. Chang, L.J. Chen, F.T. Chung, Y.T. Li, M.C. Lin, C.H. Lo, Ch. Wang, M.S. Yeh, T.C. Yu
NSRRC, Hsinchu, Taiwan



The purpose of a LowLevel Radio Frequency (LLRF) system is to control the accelerating cavity field amplitude and phase. For the Taiwan Photon Source (TPS) at NSRRC, the currently operating LLRF systems are based on analog technology. To have better RF field stability, precise control and high noise reduction, a digital LLRF control systems based on Field Programmable Gate Arrays (FPGA) was developed. We replaced the analog LLRF system with the digital version for the TPS booster ring at the beginning of 2018, and we will replace those in the storage rings in the future. Test results and operational performance of the TPS booster DLLRF system are reported here.


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※ https://doi.org/10.18429/JACoWIPAC2018WEPAL054


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THPAL045 
Determination of the Electron Bunch Length With Third Harmonic Cavity for the Taiwan Photon Source 
3745 

 Z.K. Liu, F.Y. Chang, L.H. Chang, M.H. Chang, S.W. Chang, L.J. Chen, F.T. Chung, M.C. Lin, C.H. Lo, Ch. Wang, M.S. Yeh, T.C. Yu
NSRRC, Hsinchu, Taiwan



The Taiwan Photon Source (TPS) is a modern 3 GeV low emittance light source with RMS bunch lengths of about 3 mm at a beam current of 500 mA and operating gap voltage of 3.2 MV. With a higher harmonic cavity, we could increase the Touschek lifetime and lower the heat load of invacuum undulators by lengthening the bunch lengths. Preliminary studies show that for full and uniform fill patterns, the bunch lengths could be increased by a factor of four. However, this calculation ignores phase transient effects and may overestimate the effect of harmonic cavities. A multibunch, multiparticle tracking method has been developed to determine the bunch lengths for nonuniform fill patterns, which also takes phase transient effects into account and the expected maximum bunch lengthening factor for different TPS operation conditions are discussed.


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※ https://doi.org/10.18429/JACoWIPAC2018THPAL045


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THPAL046 
EnergySavings for the TPS Booster RF System at the NSRRC in Taiwan 
3748 

 F.T. Chung, F.Y. Chang, L.H. Chang, M.H. Chang, S.W. Chang, L.J. Chen, Y.T. Li, M.C. Lin, Z.K. Liu, C.H. Lo, Ch. Wang, M.S. Yeh, T.C. Yu
NSRRC, Hsinchu, Taiwan



In this paper, we discuss an energysavings control system for the Taiwan Photon Source (TPS) booster RF system. During topup storage ring operation, a timing control is activated to reduce the booster RF transmitter energy consumption when no injection is required. Whenever injection into the TPS storage ring is needed, the booster RF transmitter is immediately adjusted to operating conditions. This timingcontrol system will save an energy of 380, 000 kWh annually.


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※ https://doi.org/10.18429/JACoWIPAC2018THPAL046


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